RAR file of 886 KB for the Sony VAIO VPCY2CADIZ-CP, a regional Y-series model code. The name does not give a board number or revision, or say whether it holds a schematic, a boardview or a BIOS image. Open the archive to identify it, then compare the MBX number on the motherboard with the document. If it turns out to be firmware, back up the existing SPI chip and check the image size against the chip before writing.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @generalschematics. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)